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Figure 3


Fig. 3. Correction turns and hits. (A) The percentage of trials in which the owl performed a correction turn towards the in-flight target loudspeaker is plotted against the in-flight stimulus delay. Significant differences between the owls are indicated and marked with asterisks depending on the significance level (*P≤0.05, **P≤0.01, ***P≤0.001). The difference between owl W and owl H was highly significant for any in-flight stimulus delay smaller than 1100 ms, but is not shown for clarity. Dotted lines indicate a significant decrease of correction turns (%) with respect to the baseline (0–700 ms). Note the decrease of the performance with increasing in-flight stimulus delay for long delays. (B) For each owl, the percentage of hits within a 20 cm radius of the in-flight target speaker is plotted. The percentage refers to the overall number of trials where the in-flight target speaker differed from the initial target speaker (owl W, 472 trials; owl Q, 475 trials; owl H, 505 trials). Significant differences are marked with asterisks (Fisher's exact test). (C) In trials in which the distance to the speaker devices was less than 3.35 m (either 2.85 m or 2.35 m), the owls failed to perform correction turns at lower in-flight stimulus delays.





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